living things found in filter

a day or so ago i saw some fry in my 5.5 gal tank, i only have zebra danios and a couple cherry shrimp, so i figured it was from the danios. then suddenly i saw none, figured they got eaten. then i wondered if some got into the filter, so i dumped the water from the filter into a bucket. after everything settled down, i saw no fry, but did see a bunch of tiny black dots darting around at the bottom. its not that i'm worried they might be parasites or anything, just curious as to what they might be. thinking about getting a microscope (really its just an excuse to get one) to see what they are. anyone ever see something similar?

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